@article{EJDE_2004__2004__a49,
     author = {Amster,  Pablo and De Napoli,  Pablo L. and Mariani,  Maria Cristina},
     title = {Existence of solutions to \(n\)-dimensional pendulum-like equations},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1129.35338},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a49/}
}